// We want remove() to fail even after a failed call to next().
    }
    assertThrows(IllegalStateException.class, () -> iterator.remove());
  }

  public void testSkip_allOfMutableList_modifiable() {
    List<String> list = newArrayList("a", "b");
    Iterator<String> iterator = skip(list, 2).iterator();
    assertThrows(IllegalStateException.class, () -> iterator.remove());
  }